检索结果-南通市图书馆

Chinese Journal of Polymer Science 2021年第4期39卷 397-416,I0004页

作者： Feng Cai yu-xuan Chen Wen-Zhong Wang Hai-Feng yu Department of Materials Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China

The great potential of liquid-crystalline block copolymers(LCBCs)containing photoresponsive mesogens toward novel applications in photonics and nanotechnology has been attracting increasing attention,due to the combination of the inherent property of microphase separation of block copolymers and the hierarchically-assembled structures of liquid-crystalline polymers(LCPs).The periodically ordered nanostructures in bulk film of LCBCs can be acquired by supramolecular cooperative motion,derived from the interaction between liquid-crystalline elastic deformation and microphase separation,which are able to improve physical properties of polymer film toward advanced functional ***,various micro/nano-patterned structures have been fabricated via light manipulation of photoresponsive LCBCs with good reproducibility and mass *** to recent developments in synthesis and polymerization techniques,diverse azobenzene-containing LCBCs have been designed,resulting in the creation of a wide variety of novel *** review illustrates recent progresses in macroscopic regulation of hierarchical nanostructures in LCBCs towards functional *** existing challenges are also discussed,showing perspectives for future studies.

关键词： Liquid-crystalline block copolymers Microphase separation Hierarchical nanostructures Functional materials

A Levenberg–Marquardt Method for Solving the Tensor Split Feasibility Problem

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2021年第4期9卷 797-817页

作者： yu-xuan Jin Jin-Ling Zhao School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

This paper considers the tensor split feasibility *** C and Q be non-empty closed convex set and A be a semi-symmetric *** tensor split feasibility problem is to find x∈C such that Axm−1∈*** we simply take this problem as a special case of the nonlinear split feasibility problem,then we can directly get a projection method to solve ***,applying this kind of projection method to solve the tensor split feasibility problem is not so *** we propose a Levenberg–Marquardt method to achieve higher *** analyses are conducted,and some preliminary numerical results show that the Levenberg–Marquardt method has advantage over the common projection method.

关键词： Tensor Split feasibility problem Semi-symmetric Projection Levenberg-Marquardt method

Single atom catalyst towards ammonia synthesis at mild conditions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2018年第9期61卷 1045-1046页

作者： Zhiwei fang Guihua yu Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin

Nitrogen is an essential nutrient element for all living organisms,however in its sufficient molecular form,nitrogen could not be utilized to meet the crucial need for global food requirements or industrial production due to its strong nonpolar N≡N triple ***,nitrogen fixation is an essential transformation but this only occurs in the nature with the help of nitrogenases[1].Although nitrogen can be artificially transformed into ammonia through the wellestablished Haber-Bosch process,the reaction is accomplished under drastic conditions,

关键词：氨合成温和条件催化剂原子氮固定工业生产有机体三元组

Emerging binary nanostructure array enables multiple nanostructures

在线全文

学校读者我要写书评

暂无评论

National Science Review 2018年第5期5卷 608-610页

作者： Jun Jiang xuan Lei Shu-Hong yu Department of Chemistry University of Science and Technology of China

Binary nanostructure array, in which the sub-component arrays are made of two(or more) different materials or structures in one unit, has been demonstrated to be an innovative principle for designing and constructing functional devices and systems [1–5]. In particular,when the binary sub-components are at the interplay distance, intimate coupling between the two components becomes dominant and endows the macroscopic materials with novel properties

关键词： Emerging binary nanostructure array enables multiple nanostructures

Ultra-sensitive detection of uranyl ions with a specially designed high-efficiency SERS-based microfluidic device

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2019年第8期62卷 1064-1071页

作者： xuan He Shaofei Wang yu Liu Xiaolin Wang College of Chemistry Sichuan UniversityChengdu 610064China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China China Academy of Engineering Physics Mianyang 621900China

The uranyl ion(UO22+) poses high risks to human health and the environment, hence its detection and monitoring is of utmost significance. However, the development of an ultra-sensitive, high-efficiency and convenient approach for on-site detection of UO22+ remains a challenge. Herein, a reliable and reusable surface-enhanced Raman spectroscopy(SERS)-based microfluidic biosensor was developed for rapid detection of UO22+ in real samples. The detection protocol involved the reaction of 5′-Rhodamine B(RhB)-labeled double-stranded DNA for UO22+-specific DNAzyme-cleavage reaction in a U-shaped microchannel. Then, the reaction products were delivered into three parallel samples for high-throughput tests by SERS biochips,where 3 D ZnO-Ag mesoporous nanosheet arrays(MNSs) were modified with a single-stranded DNA(ssDNA). The ssDNAwas sequence-complementary with the 5′-RhB-labeled cleaved-stranded DNA(csDNA) from the reaction products. By the hybridization of ssDNA and csDNA, the signal probe RhB was fixed close to the surface of the ZnO-Ag MNSs to enhance the Raman signal. The limit of detection for UO22+ with the microfluidic-SERS biosensor was 3.71×10-15 M. An over 20,000-fold selectivity towards UO22+ response was also achieved in the presence of 15 other metal ions. The high-throughput microfluidicSERS biosensor operated well for practical UO22+ detection, with excellent recoveries in contaminated river and tap water from95.2% to 106.3%(relative standard deviation(RSD)<6.0%, n=6). Although the SERS-based microfluidic biosensor developed in this study was deployed for the detection of UO22+, the reusable and high-efficiency system may be expanded to the detection of other analytes on-site.

关键词： uranyl ion DNAzyme SERS microfluidic device high-throughput reusable

Identifying storm-induced wave origins using SAR wave mode data

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2016年第10期59卷 1971-1980页

作者： WANG xuan JIANG Haoyu CHEN Ge yu fangJie College of Information Science and Engineering Ocean University of China Qingdao Collaborative Innovation Center of Marine Science and Technology Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

Because of weak dissipation effects, swells generated by fierce storms can propagate across an entire ocean basin;therefore, observing swell generation and decay and retrieving storm characteristics from a swell by satellite remote sensing are possible. In this study, based on the dispersion relation and geometrical optics principle, we used SAR wave mode data from 2003 to 2010 provided by GlobWave to track swells with peak wavelengths of more than 300 m to locate a storm-generated far-traveling swell and present the swell field related to this "static" origin. Through a comparison with ECMWF wind datasets, we conducted validations and explored some conditions that cause misjudgments in swell origins. Finally, we obtained the spatiotemporal distribution characteristics of satellite-observed swell origins(i.e., the fierce wind condition) and their evolution. This work can be used as a reference for wave models, providing early swell warnings, determining air-sea surface interactions, and determining global climate change.

关键词： SAR Fierce storm Swell tracking

A stable biocompatible porous coordination cage promotes in vivo liver tumor inhibition

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第10期14卷 3407-3415页

作者： yu Liang yu fang Yong Cui Hongcai Zhou State Key Laboratory for Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China Department of Chemistry Texas A&M UniversityCollege StationTX 77843USA

Many emerging strategies in chemo-,gene-,and immunotherapy require the accumulation of reagents in the cell ***,their delivery into the nucleus is often *** delivery could be enhanced with a rationally designed cargo-delivery scaffold,but this approach has rarely been successfully ***,a stable,biocompatible molecular capsule that encapsulates and delivers camptothecin,a DNA topoisomerase I inhibitor,into the nucleus of living cells was *** delivery is facilitated by the ultra-small diameter,zero net charge,and hydrophobicity of the *** encapsulated drug complex displays superior toxicity towards multiple cancer cells over the free drug,the Food and Drug Administration(FDA)approved drugs,as well as conventionally reported drug ***,it inhibits liver cancer tumor growth in a xenograft mouse *** of the properties of such molecular capsules may make it possible to design therapeutic strategies that target specific cell organelles.

关键词： metal-organic polyhedron biocompatible cage compound cavity drug delivery

Tunable enhanced spatial shifts of reflective beam on the surface of a twisted bilayer of hBN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第6期31卷 379-386页

作者： yu-Bo Li Hao-yuan Song yu-Qi Zhang Xiang-Guang Wang Shu-fang Fu xuan-Zhang Wang Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Educationand School of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

We investigated Goos-Hänchen(GH)and Imbert-Fedorov(IF)shifts of a reflective beam on a twisted bilayer of hexagonal boron nitride(hBN),where a left circularly polarized beam was incident on the *** results demonstrate that the twist angle between the two optical axes plays an important role in obtaining large shifts with a high *** GH shift with 10λ_(0) is achieved,while the reflectivity is near 100%by tuning the twist *** maximum of the IF shift is found in the certain condition satisfied by the reflective coefficients,and the shift strongly depends on the twist angle between the optical axes of the two *** spatial shifts obtained directly from the GH and IF shift definitions were provided,which indicate that the theoretical results from the stationary phase method are *** results may open up a new way for developing the nano-optical devices.

关键词： Goos-H?nchen shift Imbert-Fedorov shift hBN reststrahlen band

Efficacyand Safetyof Huashi Baidu Granules in Treating Patients with SARS-CoV-2Omicron Variant: A Single-Center Retrospective Cohort Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第2期30卷 107-114页

作者： CHEN Cai-yu ZHANG Wen XU Xiang-ru PU yu-ting TU Ya-dan PENG Wei YAO xuan ZHOU Shuang fang Bang-jiang Department of Emergency Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai(200032)China Department of Classical Traditional Chinese Medicine Chongqing Hospital of Traditional Chinese MedicineChongqing(400021)China Acupuncture and Massage College Shanghai University of Traditional Chinese MedicineShanghai(201203)China Institute of Emergency and Critical Care Medicine Shanghai University of Traditional Chinese MedicineShanghai(200032)China

Objective:To evaluate the efficacy and safety of Huashi Baidu Granules(HSBD)in treating patients with severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)Omicron ***:A single-center retrospective cohort study was conducted during COVID-19 Omicron epidemic in the Mobile Cabin Hospital of Shanghai New International Expo Center from April 1st to May 23rd,*** COVID-19 patients with asymptomatic or mild infection were assigned to the treatment group(HSBD users)and the control group(non-HSBD users).After propensity score matching in a 1:1 ratio,496 HSBD users of treatment group were matched by propensity score to 496 non-HSBD *** in the treatment group were administrated HSBD(5 g/bag)orally for 1 bag twice a day for 7 consecutive *** in the control group received standard care and routine *** primary outcomes were the negative conversion time of nucleic acid and negative conversion rate at day *** outcomes included the hospitalized days,the time of the first nucleic acid negative conversion,and new-onset symptoms in asymptomatic *** events(AEs)that occurred during the study were *** subgroup analysis was conducted in vaccinated(378 HSBD users and 390 non-HSBD users)and unvaccinated patients(118 HSBD users and 106 non-HSBD users).Results:The median negative conversion time of nucleic acid in the treatment group was significantly shortened than the control group[3 days(IQR:2-5 days)vs.5 days(IQR:4-6 days);P<0.01].The negative conversion rate of nucleic acid in the treatment group were significantly higher than those in the control group at day 7(91.73%vs.86.90%,P=0.014).Compared with the control group,the hospitalized days in the treatment group were significantly reduced[10 days(IQR:8-11 days)vs.11 days(IQR:10.25-12 days);P<0.01].The time of the first nucleic acid negative conversion had significant differences between the treatment and control groups[3 days(IQR:2-4 days)vs.5 days(IQR:

关键词： Huashi Baidu Granule severe acute respiratory syndrome coronavirus 2 Omicron variant retrospective cohort trial Chinese medicine

Rts: learning robustly from time series data with noisy label

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第6期18卷 186332-186332页

作者： ZHOU Zhi JIN Yi-xuan Li yu-Feng National Key Laboratory for Novel Software Technology Nanjing University

Significant progress has been made in machine learning with large amounts of clean labels and static data. However, in many real-world applications, the data often changes with time and it is difficult to obtain massive clean annotations, that is, noisy labels and time series are faced simultaneously. For example, in product-buyer evaluation, each sample records the daily time behavior of users, but the long transaction period brings difficulties to analysis, and salespeople often erroneously annotate the user’s purchase behavior. Such a novel setting, to our best knowledge, has not been thoroughly studied yet, and there is still a lack of effective machine learning methods. In this paper, we present a systematic approach RTS both theoretically and empirically, consisting of two components, Noise-Tolerant Time Series Representation and Purified Oversampling Learning. Specifically, we propose reducing label noise’s destructive impact to obtain robust feature representations and potential clean samples. Then, a novel learning method based on the purified data and time series oversampling is adopted to train an unbiased model. Theoretical analysis proves that our proposal can improve the quality of the noisy data set. Empirical experiments on diverse tasks, such as the house-buyer evaluation task from real-world applications and various benchmark tasks, clearly demonstrate that our new algorithm robustly outperforms many competitive methods.

关键词： weakly-supervised learning time-series classification class-imbalanced learning